When Did the Apple Watch Series 4 Come Out ? The Apple Watch Series 4 was officially announced on September 12, 2018, during Apple’s annual fall event at the Steve Jobs Theater in Cupertino, California. Pre-orders for the device began shortly after the announcement, and it was officially released on September 21, 2018. As the first major redesign since the original Apple Watch launched in 2015, the Series 4 introduced a larger display with thinner bezels, increasing screen size to 40mm and 44mm compared to the previous 38mm and 42mm models.